标题： 一种新Kondo晶格化合物CeCoInGa中的各向异性杂化$_3$ 显示英文标题

标题： Anisotropic hybridization in a new Kondo lattice compound CeCoInGa$_3$

摘要： 我们报告了在实验和理论上对单晶CeCoInGa$_3$的详细比较研究。 电阻率测量显示了Kondo晶格的典型行为，相干温度开始于$T^*\approx 50\,$K。在低温下，磁比热可以用自旋涨落模型很好地拟合，得到一个大的索末菲系数，$\gamma\approx172\,$mJ/mol K$^2$在6 K时，表明这是一种具有显著相干效应的重费米子化合物。 磁化率在$T_{\chi}$处表现出一个宽广的场独立峰，并在$bc$平面内显示出明显的各向异性，反映了高温下相干效应的各向异性。 这些结果与结合第一性原理能带计算和动力学平均场理论的强关联计算进行了比较。 我们的结果确认了大约在50 K时开始出现相干效应，并揭示了杂化能隙中类似的各向异性，表明低温费米液体态的杂化强度与高温相干效应之间存在密切联系。 显示英文摘要

摘要： We report a detailed and comparative study of the single crystal CeCoInGa$_3$ in both experiment and theory. Resistivity measurements reveal the typical behavior of Kondo lattice with the onset temperature of coherence, $T^*\approx 50\,$K. The magnetic specific heat can be well fitted using a spin-fluctuation model at low temperatures, yielding a large Sommerfeld coefficient, $\gamma\approx172\,$mJ/mol K$^2$ at 6 K, suggesting that this is a heavy-fermion compound with a pronounced coherence effect. The magnetic susceptibility exhibits a broad field-independent peak at $T_{\chi}$ and shows an obvious anisotropy within the $bc$ plane, reflecting the anisotropy of the coherence effect at high temperatures. These are compared with strongly correlated calculations combining first-principles band structure calculations and dynamical mean-field theory. Our results confirm the onset of coherence at about 50 K and reveal a similar anisotropy in the hybridization gap, pointing to a close connection between the hybridization strength of the low-temperature Fermi-liquid state and the high-temperature coherence effect.